196 lines
7.8 KiB
C++
196 lines
7.8 KiB
C++
// Copyright (c) 2020 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "services/device/hid/hid_connection_fido.h"
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#include "base/bind.h"
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#include "base/files/file_descriptor_watcher_posix.h"
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#include "base/location.h"
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#include "base/numerics/safe_math.h"
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#include "base/posix/eintr_wrapper.h"
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#include "base/single_thread_task_runner.h"
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#include "base/task/post_task.h"
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#include "base/threading/scoped_blocking_call.h"
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#include "base/threading/thread_restrictions.h"
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#include "base/threading/thread_task_runner_handle.h"
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#include "components/device_event_log/device_event_log.h"
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#include "services/device/hid/hid_service.h"
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namespace device {
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class HidConnectionFido::BlockingTaskHelper {
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public:
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BlockingTaskHelper(base::ScopedFD fd,
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scoped_refptr<HidDeviceInfo> device_info,
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base::WeakPtr<HidConnectionFido> connection)
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: fd_(std::move(fd)),
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// Report buffers must always have room for the report ID.
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report_buffer_size_(device_info->max_input_report_size() + 1),
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has_report_id_(device_info->has_report_id()), connection_(connection),
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origin_task_runner_(base::ThreadTaskRunnerHandle::Get()) {
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DETACH_FROM_SEQUENCE(sequence_checker_);
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}
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~BlockingTaskHelper() { DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_); }
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// Starts the FileDescriptorWatcher that reads input events from the device.
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// Must be called on a thread that has a base::MessageLoopForIO.
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void Start() {
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DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
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base::internal::AssertBlockingAllowed();
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file_watcher_ = base::FileDescriptorWatcher::WatchReadable(
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fd_.get(), base::Bind(&BlockingTaskHelper::OnFileCanReadWithoutBlocking,
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base::Unretained(this)));
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}
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void Write(scoped_refptr<base::RefCountedBytes> buffer,
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WriteCallback callback) {
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DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
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base::ScopedBlockingCall scoped_blocking_call(
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FROM_HERE, base::BlockingType::MAY_BLOCK);
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auto data = buffer->front();
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size_t size = buffer->size();
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// if report id is 0, it shouldn't be included
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if (data[0] == 0) {
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data++;
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size--;
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}
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ssize_t result = HANDLE_EINTR(write(fd_.get(), data, size));
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bool success = static_cast<size_t>(result) == size;
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if (!success) {
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HID_LOG(EVENT) << "HID write failed: " << result << " != " << size;
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}
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origin_task_runner_->PostTask(FROM_HERE,
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base::BindOnce(std::move(callback), success));
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}
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void GetFeatureReport(uint8_t report_id,
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scoped_refptr<base::RefCountedBytes> buffer,
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ReadCallback callback) {
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DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
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base::ScopedBlockingCall scoped_blocking_call(
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FROM_HERE, base::BlockingType::MAY_BLOCK);
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HID_PLOG(EVENT) << "GendFeatureReport not implemented on OpenBSD";
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origin_task_runner_->PostTask(
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FROM_HERE, base::BindOnce(std::move(callback), false, nullptr, 0));
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}
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void SendFeatureReport(scoped_refptr<base::RefCountedBytes> buffer,
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WriteCallback callback) {
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DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
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HID_PLOG(EVENT) << "SendFeatureReport not implemented on OpenBSD";
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origin_task_runner_->PostTask(FROM_HERE,
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base::BindOnce(std::move(callback), false));
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}
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private:
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void OnFileCanReadWithoutBlocking() {
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DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
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scoped_refptr<base::RefCountedBytes> buffer(
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new base::RefCountedBytes(report_buffer_size_));
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unsigned char *data = buffer->front();
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size_t length = report_buffer_size_;
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if (!has_report_id_) {
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// OpenBSD will not prefix the buffer with a report ID if report IDs are
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// not used by the device. Prefix the buffer with 0.
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*data++ = 0;
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length--;
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}
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ssize_t bytes_read = HANDLE_EINTR(read(fd_.get(), data, length));
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if (bytes_read < 0) {
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if (errno != EAGAIN) {
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HID_PLOG(EVENT) << "Read failed";
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// This assumes that the error is unrecoverable and disables reading
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// from the device until it has been re-opened.
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// TODO(reillyg): Investigate starting and stopping the file descriptor
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// watcher in response to pending read requests so that per-request
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// errors can be returned to the client.
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file_watcher_.reset();
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}
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return;
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}
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if (!has_report_id_) {
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// Behave as if the byte prefixed above as the the report ID was read.
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bytes_read++;
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}
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origin_task_runner_->PostTask(
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FROM_HERE, base::BindOnce(&HidConnectionFido::ProcessInputReport,
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connection_, buffer, bytes_read));
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}
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SEQUENCE_CHECKER(sequence_checker_);
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base::ScopedFD fd_;
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const size_t report_buffer_size_;
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const bool has_report_id_;
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base::WeakPtr<HidConnectionFido> connection_;
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const scoped_refptr<base::SequencedTaskRunner> origin_task_runner_;
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std::unique_ptr<base::FileDescriptorWatcher::Controller> file_watcher_;
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DISALLOW_COPY_AND_ASSIGN(BlockingTaskHelper);
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};
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HidConnectionFido::HidConnectionFido(
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scoped_refptr<HidDeviceInfo> device_info, base::ScopedFD fd,
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scoped_refptr<base::SequencedTaskRunner> blocking_task_runner)
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: HidConnection(device_info),
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blocking_task_runner_(std::move(blocking_task_runner)),
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weak_factory_(this),
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helper_(std::make_unique<BlockingTaskHelper>(
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std::move(fd), device_info, weak_factory_.GetWeakPtr())) {
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blocking_task_runner_->PostTask(
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FROM_HERE, base::BindOnce(&BlockingTaskHelper::Start,
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base::Unretained(helper_.get())));
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}
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HidConnectionFido::~HidConnectionFido() = default;
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void HidConnectionFido::PlatformClose() {
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// By closing the device on the blocking task runner 1) the requirement that
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// base::ScopedFD is destroyed on a thread where I/O is allowed is satisfied
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// and 2) any tasks posted to this task runner that refer to this file will
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// complete before it is closed.
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blocking_task_runner_->DeleteSoon(FROM_HERE, helper_.release());
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}
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void HidConnectionFido::PlatformWrite(
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scoped_refptr<base::RefCountedBytes> buffer, WriteCallback callback) {
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blocking_task_runner_->PostTask(
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FROM_HERE, base::BindOnce(&BlockingTaskHelper::Write,
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base::Unretained(helper_.get()), buffer,
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std::move(callback)));
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}
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void HidConnectionFido::PlatformGetFeatureReport(uint8_t report_id,
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ReadCallback callback) {
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// The first byte of the destination buffer is the report ID being requested
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// and is overwritten by the feature report.
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DCHECK_GT(device_info()->max_feature_report_size(), 0u);
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scoped_refptr<base::RefCountedBytes> buffer(
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new base::RefCountedBytes(device_info()->max_feature_report_size() + 1));
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if (report_id != 0)
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buffer->data()[0] = report_id;
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blocking_task_runner_->PostTask(
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FROM_HERE, base::BindOnce(&BlockingTaskHelper::GetFeatureReport,
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base::Unretained(helper_.get()), report_id,
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buffer, std::move(callback)));
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}
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void HidConnectionFido::PlatformSendFeatureReport(
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scoped_refptr<base::RefCountedBytes> buffer, WriteCallback callback) {
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base::ScopedBlockingCall scoped_blocking_call(FROM_HERE,
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base::BlockingType::MAY_BLOCK);
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blocking_task_runner_->PostTask(
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FROM_HERE, base::BindOnce(&BlockingTaskHelper::SendFeatureReport,
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base::Unretained(helper_.get()), buffer,
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std::move(callback)));
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}
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} // namespace device
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